Contortionist

Contortionists can manipulate their bodies into bizarre patterns and shapes. They can even fit through keyholes, into chests, and through bars. No prisons can keep them. No walls can keep them. Nothing, save sealed off space can keep then from obtaining their goals.

Dislocate

Starting at 3rd level, you can shape your body into bizarre shapes. You can fit your body into a space no smaller then a 1 foot cube. While you are in this condition, you are considered incapacitated. It takes an action to enter this state, and an action to exit it. You gain advantage on stealth checks while in this state.
This ability only works if you are not wearing armor.

Squeeze

At 3rd level, you can manipulate the bones in your body to fit through smaller passages. When determining size for moving through passages, you count as one size category smaller.

This ability only works if you are not wearing armor.

Keyhole Passage

At 9th level, you can fit through a space as small as a keyhole, provided you gain some momentum, of course. If you move at least 10 feet in a single direction, then you can fit through a space as small as a 1x1 inch space without squeezing. If the tight space is no longer than 5 feet, you arrive at the other side with no injuries. For each additional foot, you take a cumulative 1d6 bludgeoning damage to a maximum of 10 feet. If the space is longer than 10 feet, you get shunted out where you went in, and take 5d6 bludgeoning damage.

This ability only works if you are not wearing armor.

Contortist's Dodge

At 13th level, you can dislocate your body to dodge attacks such as the swinging of a sword, or the piercing of an arrow. If you are not wearing any armor, you gain a +3 bonus to armor class.

Supreme Contortionist's Dodge

At 17th level, you can dislocate your body in such a way that prevents area damage from hitting you, such as a blue dragon's lightning breath or a Fireball spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

In addition, the AC bonus you receive from your Contortionist's Dodge is increased to +5.